include/SDL_joystick.h
author Sam Lantinga <slouken@libsdl.org>
Sat, 18 May 2013 14:17:52 -0700
changeset 7191 75360622e65f
parent 6974 11a03a79dfe8
child 7341 675c85d46f30
permissions -rw-r--r--
File style cleanup for the SDL 2.0 release
     1 /*
     2   Simple DirectMedia Layer
     3   Copyright (C) 1997-2013 Sam Lantinga <slouken@libsdl.org>
     4 
     5   This software is provided 'as-is', without any express or implied
     6   warranty.  In no event will the authors be held liable for any damages
     7   arising from the use of this software.
     8 
     9   Permission is granted to anyone to use this software for any purpose,
    10   including commercial applications, and to alter it and redistribute it
    11   freely, subject to the following restrictions:
    12 
    13   1. The origin of this software must not be misrepresented; you must not
    14      claim that you wrote the original software. If you use this software
    15      in a product, an acknowledgment in the product documentation would be
    16      appreciated but is not required.
    17   2. Altered source versions must be plainly marked as such, and must not be
    18      misrepresented as being the original software.
    19   3. This notice may not be removed or altered from any source distribution.
    20 */
    21 
    22 /**
    23  *  \file SDL_joystick.h
    24  *
    25  *  Include file for SDL joystick event handling
    26  *
    27  * The term "device_index" identifies currently plugged in joystick devices between 0 and SDL_NumJoysticks, with the exact joystick
    28  *   behind a device_index changing as joysticks are plugged and unplugged.
    29  *
    30  * The term "instance_id" is the current instantiation of a joystick device in the system, if the joystick is removed and then re-inserted
    31  *   then it will get a new instance_id, instance_id's are monotonically increasing identifiers of a joystick plugged in.
    32  *
    33  * The term JoystickGUID is a stable 128-bit identifier for a joystick device that does not change over time, it identifies class of
    34  *   the device (a X360 wired controller for example). This identifier is platform dependent.
    35  *
    36  *
    37  */
    38 
    39 #ifndef _SDL_joystick_h
    40 #define _SDL_joystick_h
    41 
    42 #include "SDL_stdinc.h"
    43 #include "SDL_error.h"
    44 
    45 #include "begin_code.h"
    46 /* Set up for C function definitions, even when using C++ */
    47 #ifdef __cplusplus
    48 extern "C" {
    49 #endif
    50 
    51 /**
    52  *  \file SDL_joystick.h
    53  *
    54  *  In order to use these functions, SDL_Init() must have been called
    55  *  with the ::SDL_INIT_JOYSTICK flag.  This causes SDL to scan the system
    56  *  for joysticks, and load appropriate drivers.
    57  */
    58 
    59 /* The joystick structure used to identify an SDL joystick */
    60 struct _SDL_Joystick;
    61 typedef struct _SDL_Joystick SDL_Joystick;
    62 
    63 /* A structure that encodes the stable unique id for a joystick device */
    64 typedef struct {
    65     Uint8 data[16];
    66 } SDL_JoystickGUID;
    67 
    68 typedef Sint32 SDL_JoystickID;
    69 
    70 
    71 /* Function prototypes */
    72 /**
    73  *  Count the number of joysticks attached to the system right now
    74  */
    75 extern DECLSPEC int SDLCALL SDL_NumJoysticks(void);
    76 
    77 /**
    78  *  Get the implementation dependent name of a joystick.
    79  *  This can be called before any joysticks are opened.
    80  *  If no name can be found, this function returns NULL.
    81  */
    82 extern DECLSPEC const char *SDLCALL SDL_JoystickNameForIndex(int device_index);
    83 
    84 /**
    85  *  Open a joystick for use.
    86  *  The index passed as an argument refers tothe N'th joystick on the system.
    87  *  This index is the value which will identify this joystick in future joystick
    88  *  events.
    89  *
    90  *  \return A joystick identifier, or NULL if an error occurred.
    91  */
    92 extern DECLSPEC SDL_Joystick *SDLCALL SDL_JoystickOpen(int device_index);
    93 
    94 /**
    95  *  Return the name for this currently opened joystick.
    96  *  If no name can be found, this function returns NULL.
    97  */
    98 extern DECLSPEC const char *SDLCALL SDL_JoystickName(SDL_Joystick * joystick);
    99 
   100 /**
   101  *  Return the GUID for the joystick at this index
   102  */
   103 extern DECLSPEC SDL_JoystickGUID SDLCALL SDL_JoystickGetDeviceGUID(int device_index);
   104 
   105 /**
   106  *  Return the GUID for this opened joystick
   107  */
   108 extern DECLSPEC SDL_JoystickGUID SDLCALL SDL_JoystickGetGUID(SDL_Joystick * joystick);
   109 
   110 /**
   111  *  Return a string representation for this guid. pszGUID must point to at least 33 bytes
   112  *  (32 for the string plus a NULL terminator).
   113  */
   114 extern DECLSPEC void SDL_JoystickGetGUIDString(SDL_JoystickGUID guid, char *pszGUID, int cbGUID);
   115 
   116 /**
   117  *  convert a string into a joystick formatted guid
   118  */
   119 extern DECLSPEC SDL_JoystickGUID SDLCALL SDL_JoystickGetGUIDFromString(const char *pchGUID);
   120 
   121 /**
   122  *  Returns SDL_TRUE if the joystick has been opened and currently connected, or SDL_FALSE if it has not.
   123  */
   124 extern DECLSPEC SDL_bool SDLCALL SDL_JoystickGetAttached(SDL_Joystick * joystick);
   125 
   126 /**
   127  *  Get the instance ID of an opened joystick or -1 if the joystick is invalid.
   128  */
   129 extern DECLSPEC SDL_JoystickID SDLCALL SDL_JoystickInstanceID(SDL_Joystick * joystick);
   130 
   131 /**
   132  *  Get the number of general axis controls on a joystick.
   133  */
   134 extern DECLSPEC int SDLCALL SDL_JoystickNumAxes(SDL_Joystick * joystick);
   135 
   136 /**
   137  *  Get the number of trackballs on a joystick.
   138  *
   139  *  Joystick trackballs have only relative motion events associated
   140  *  with them and their state cannot be polled.
   141  */
   142 extern DECLSPEC int SDLCALL SDL_JoystickNumBalls(SDL_Joystick * joystick);
   143 
   144 /**
   145  *  Get the number of POV hats on a joystick.
   146  */
   147 extern DECLSPEC int SDLCALL SDL_JoystickNumHats(SDL_Joystick * joystick);
   148 
   149 /**
   150  *  Get the number of buttons on a joystick.
   151  */
   152 extern DECLSPEC int SDLCALL SDL_JoystickNumButtons(SDL_Joystick * joystick);
   153 
   154 /**
   155  *  Update the current state of the open joysticks.
   156  *
   157  *  This is called automatically by the event loop if any joystick
   158  *  events are enabled.
   159  */
   160 extern DECLSPEC void SDLCALL SDL_JoystickUpdate(void);
   161 
   162 /**
   163  *  Enable/disable joystick event polling.
   164  *
   165  *  If joystick events are disabled, you must call SDL_JoystickUpdate()
   166  *  yourself and check the state of the joystick when you want joystick
   167  *  information.
   168  *
   169  *  The state can be one of ::SDL_QUERY, ::SDL_ENABLE or ::SDL_IGNORE.
   170  */
   171 extern DECLSPEC int SDLCALL SDL_JoystickEventState(int state);
   172 
   173 /**
   174  *  Get the current state of an axis control on a joystick.
   175  *
   176  *  The state is a value ranging from -32768 to 32767.
   177  *
   178  *  The axis indices start at index 0.
   179  */
   180 extern DECLSPEC Sint16 SDLCALL SDL_JoystickGetAxis(SDL_Joystick * joystick,
   181                                                    int axis);
   182 
   183 /**
   184  *  \name Hat positions
   185  */
   186 /*@{*/
   187 #define SDL_HAT_CENTERED    0x00
   188 #define SDL_HAT_UP      0x01
   189 #define SDL_HAT_RIGHT       0x02
   190 #define SDL_HAT_DOWN        0x04
   191 #define SDL_HAT_LEFT        0x08
   192 #define SDL_HAT_RIGHTUP     (SDL_HAT_RIGHT|SDL_HAT_UP)
   193 #define SDL_HAT_RIGHTDOWN   (SDL_HAT_RIGHT|SDL_HAT_DOWN)
   194 #define SDL_HAT_LEFTUP      (SDL_HAT_LEFT|SDL_HAT_UP)
   195 #define SDL_HAT_LEFTDOWN    (SDL_HAT_LEFT|SDL_HAT_DOWN)
   196 /*@}*/
   197 
   198 /**
   199  *  Get the current state of a POV hat on a joystick.
   200  *
   201  *  The hat indices start at index 0.
   202  *
   203  *  \return The return value is one of the following positions:
   204  *           - ::SDL_HAT_CENTERED
   205  *           - ::SDL_HAT_UP
   206  *           - ::SDL_HAT_RIGHT
   207  *           - ::SDL_HAT_DOWN
   208  *           - ::SDL_HAT_LEFT
   209  *           - ::SDL_HAT_RIGHTUP
   210  *           - ::SDL_HAT_RIGHTDOWN
   211  *           - ::SDL_HAT_LEFTUP
   212  *           - ::SDL_HAT_LEFTDOWN
   213  */
   214 extern DECLSPEC Uint8 SDLCALL SDL_JoystickGetHat(SDL_Joystick * joystick,
   215                                                  int hat);
   216 
   217 /**
   218  *  Get the ball axis change since the last poll.
   219  *
   220  *  \return 0, or -1 if you passed it invalid parameters.
   221  *
   222  *  The ball indices start at index 0.
   223  */
   224 extern DECLSPEC int SDLCALL SDL_JoystickGetBall(SDL_Joystick * joystick,
   225                                                 int ball, int *dx, int *dy);
   226 
   227 /**
   228  *  Get the current state of a button on a joystick.
   229  *
   230  *  The button indices start at index 0.
   231  */
   232 extern DECLSPEC Uint8 SDLCALL SDL_JoystickGetButton(SDL_Joystick * joystick,
   233                                                     int button);
   234 
   235 /**
   236  *  Close a joystick previously opened with SDL_JoystickOpen().
   237  */
   238 extern DECLSPEC void SDLCALL SDL_JoystickClose(SDL_Joystick * joystick);
   239 
   240 
   241 /* Ends C function definitions when using C++ */
   242 #ifdef __cplusplus
   243 }
   244 #endif
   245 #include "close_code.h"
   246 
   247 #endif /* _SDL_joystick_h */
   248 
   249 /* vi: set ts=4 sw=4 expandtab: */